Roughly three years from now, Orly Airport--one of the two major airports in Paris--will draw geothermal energy from beneath the field to save on heating costs.

The earth's core will serve as an organic radiator after the city and airport officials drill two 1-mile bore holes to tap the water table under the airport's perimeter. Naturally pressurized water, measuring 74 degrees Celsius (165 degrees Fahrenheit), will run through the airport's heating system and will then be pumed back into to the ground at 45 degrees C (113 F).

Ecofriend says that the project will follow a technical and financial feasibility study and is likely to amount to 11 million euros (17.27 million dollars) in total cost. Several terminals, a business center and a nearby hotel are to be integrated in the new geothermal heating system starting 2011.